89Sr治疗骨转移癌的剂量下列哪种正确（）。 A.剂量越大越好 B.剂量越小越好 C

下列（）不是是目前确定液压设备状态的常用方法.

A.功能诊断法

B.振动诊断法

C.声学诊断法

D.常数诊断法

某上市公司股本总额6000万元，股票面值10元，以下情况中，哪一个构成该公司股票暂停上市的原因()

A．公司决定将股本总额减少1000万元

B．为买现上述决定，公司收购本公司股票100万股

C．由于上述收购，持有股票面值达1000元以上的本公司股东人数变为950人

D．由于上述收购，向社会公开发行的股份总数变为125万股

阅读理解。

     Scientists warn today that the Atlantic bluefin tuna(金枪鱼)faces disappearance unless certain

action is taken. They used electronic ways to track the movement of the powerful fish from the

Gulf of Mexico to the Mediterranean, and report today in the journal Nature that meals of sushi

and sandwiches with tuna worldwide are more dangerous than anyone has imagined.

     The bluefin tuna can live for 30 years, grow to three metres in length and weigh as much as

700kg. A good one can fetch as much as ? 52,000 in the Tokyo fish markets. "In my lifetime,

we've brought this big fish to the doorstep of death in the western Atlantic Ocean," said Barbara

Block of Stanford University in California. "The electronic way of tracks provides the best scientific

information we've ever had to manage these tuna and we must, as an international community, start

to act actively to make sure of the future of this fish. "

      Scientists have repeatedly said that the harvest of the seas cannot be as good as before. There

are fewer and fewer fish in around Newfoundland, North Sea and Iceland, so fishermen have

pushed further offshore in search of deep ocean fish. Tuna-in the Mediterranean and Japan-have

been under increasing pressure for years. The International Commission on the Conservation of

Atlantic Tuna has tried to manage the fish since 1969．There are two populations: a western one

that has dropped by 80% in the past 30 years, and a larger, eastern population. Although catches

are controlled by 3,000 tons a year in the western fishery, and 32,000 in the east, no one knew

whether the limits worked.

      So Professor Block and her team placed tracks on hundreds of the fish and tracked them to

depths of more than 900 metres and on journeys of thousands of miles, measuring the movement,

body and water temperatures. "There are two ways to save the Atlantic bluefin tuna-protect them

in their production grounds and in their feeding grounds," Prof. Block said. "This will need immediate

action in both the central Atlantic, to reduce the loss of the big fish while hunting, and in the Gulf of

Mexico and Mediterranean, where tuna produce as separate populations. "

1. The bluefin tuna in this passage mainly refers to the one _______.

A．in the Atlantic

B．in the Pacific  

C．in the Gulf of Mexico  

D．in the Mediterranean

2. Which of the following is NOT true according to this passage?

A．The bluefin tuna is a kind of large and heavy fish.

B．The number of the bluefin tuna in the sea is getting smaller and smaller.

C．Scientists are worried about the future of the tuna.

D．Scientists think that the harvest of the seas will remain good.

3. The purpose of the passage is to ______.

A．tell people a new way has been found to save the bluefin tuna

B．call for action to save the bluefin tuna  

C．warn people not to eat tuna sandwiches anymore

D．help scientists to find a new way to save the bluefin tuna

粪便潜血检查结果呈强阳性的疾病是（）

A.前胃弛缓

B.瘤胃积食

C.瘤胃臌气

D.创伤性网胃炎

E.瓣胃阻塞

（）是指供应商的规模和层次应与采购商相当。

A．门当户对原则

B．系统全面原则

C．简明科学性原则

D．供应链战略原则